2.6.25-rc7

 net

 mac80211

diff --git a/net/mac80211/rc80211_pid_debugfs.c b/net/mac80211/rc80211_pid_debugfs.c
new file mode 100644
index 0000000..88b8dc9
--- /dev/null
+++ b/net/mac80211/rc80211_pid_debugfs.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2007, Mattias Nissler <mattias.nissler@gmx.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/poll.h>
+#include <linux/netdevice.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+
+#include <net/mac80211.h>
+#include "ieee80211_rate.h"
+
+#include "rc80211_pid.h"
+
+static void rate_control_pid_event(struct rc_pid_event_buffer *buf,
+               enum rc_pid_event_type type,
+               union rc_pid_event_data *data)
+{
+   struct rc_pid_event *ev;
+   unsigned long status;
+
+   spin_lock_irqsave(&buf->lock, status);
+   ev = &(buf->ring[buf->next_entry]);
+   buf->next_entry = (buf->next_entry + 1) % RC_PID_EVENT_RING_SIZE;
+
+   ev->timestamp = jiffies;
+   ev->id = buf->ev_count++;
+   ev->type = type;
+   ev->data = *data;
+
+   spin_unlock_irqrestore(&buf->lock, status);
+
+   wake_up_all(&buf->waitqueue);
+}
+
+void rate_control_pid_event_tx_status(struct rc_pid_event_buffer *buf,
+                    struct ieee80211_tx_status *stat)
+{
+   union rc_pid_event_data evd;
+
+   memcpy(&evd.tx_status, stat, sizeof(struct ieee80211_tx_status));
+   rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_STATUS, &evd);
+}
+
+void rate_control_pid_event_rate_change(struct rc_pid_event_buffer *buf,
+                      int index, int rate)
+{
+   union rc_pid_event_data evd;
+
+   evd.index = index;
+   evd.rate = rate;
+   rate_control_pid_event(buf, RC_PID_EVENT_TYPE_RATE_CHANGE, &evd);
+}
+
+void rate_control_pid_event_tx_rate(struct rc_pid_event_buffer *buf,
+                  int index, int rate)
+{
+   union rc_pid_event_data evd;
+
+   evd.index = index;
+   evd.rate = rate;
+   rate_control_pid_event(buf, RC_PID_EVENT_TYPE_TX_RATE, &evd);
+}
+
+void rate_control_pid_event_pf_sample(struct rc_pid_event_buffer *buf,
+                    s32 pf_sample, s32 prop_err,
+                    s32 int_err, s32 der_err)
+{
+   union rc_pid_event_data evd;
+
+   evd.pf_sample = pf_sample;
+   evd.prop_err = prop_err;
+   evd.int_err = int_err;
+   evd.der_err = der_err;
+   rate_control_pid_event(buf, RC_PID_EVENT_TYPE_PF_SAMPLE, &evd);
+}
+
+static int rate_control_pid_events_open(struct inode *inode, struct file *file)
+{
+   struct rc_pid_sta_info *sinfo = inode->i_private;
+   struct rc_pid_event_buffer *events = &sinfo->events;
+   struct rc_pid_events_file_info *file_info;
+   unsigned int status;
+
+   /* Allocate a state struct */
+   file_info = kmalloc(sizeof(*file_info), GFP_KERNEL);
+   if (file_info == NULL)
+      return -ENOMEM;
+
+   spin_lock_irqsave(&events->lock, status);
+
+   file_info->next_entry = events->next_entry;
+   file_info->events = events;
+
+   spin_unlock_irqrestore(&events->lock, status);
+
+   file->private_data = file_info;
+
+   return 0;
+}
+
+static int rate_control_pid_events_release(struct inode *inode,
+                  struct file *file)
+{
+   struct rc_pid_events_file_info *file_info = file->private_data;
+
+   kfree(file_info);
+
+   return 0;
+}
+
+static unsigned int rate_control_pid_events_poll(struct file *file,
+                   poll_table *wait)
+{
+   struct rc_pid_events_file_info *file_info = file->private_data;
+
+   poll_wait(file, &file_info->events->waitqueue, wait);
+
+   return POLLIN | POLLRDNORM;
+}
+
+#define RC_PID_PRINT_BUF_SIZE 64
+
+static ssize_t rate_control_pid_events_read(struct file *file, char __user *buf,
+                   size_t length, loff_t *offset)
+{
+   struct rc_pid_events_file_info *file_info = file->private_data;
+   struct rc_pid_event_buffer *events = file_info->events;
+   struct rc_pid_event *ev;
+   char pb[RC_PID_PRINT_BUF_SIZE];
+   int ret;
+   int p;
+   unsigned int status;
+
+   /* Check if there is something to read. */
+   if (events->next_entry == file_info->next_entry) {
+      if (file->f_flags & O_NONBLOCK)
+         return -EAGAIN;
+
+      /* Wait */
+      ret = wait_event_interruptible(events->waitqueue,
+            events->next_entry != file_info->next_entry);
+
+      if (ret)
+         return ret;
+   }
+
+   /* Write out one event per call. I don't care whether it's a little
+    * inefficient, this is debugging code anyway. */
+   spin_lock_irqsave(&events->lock, status);
+
+   /* Get an event */
+   ev = &(events->ring[file_info->next_entry]);
+   file_info->next_entry = (file_info->next_entry + 1) %
+            RC_PID_EVENT_RING_SIZE;
+
+   /* Print information about the event. Note that userpace needs to
+    * provide large enough buffers. */
+   length = length < RC_PID_PRINT_BUF_SIZE ?
+       length : RC_PID_PRINT_BUF_SIZE;
+   p = snprintf(pb, length, "%u %lu ", ev->id, ev->timestamp);
+   switch (ev->type) {
+   case RC_PID_EVENT_TYPE_TX_STATUS:
+      p += snprintf(pb + p, length - p, "tx_status %u %u",
+               ev->data.tx_status.excessive_retries,
+               ev->data.tx_status.retry_count);
+      break;
+   case RC_PID_EVENT_TYPE_RATE_CHANGE:
+      p += snprintf(pb + p, length - p, "rate_change %d %d",
+               ev->data.index, ev->data.rate);
+      break;
+   case RC_PID_EVENT_TYPE_TX_RATE:
+      p += snprintf(pb + p, length - p, "tx_rate %d %d",
+               ev->data.index, ev->data.rate);
+      break;
+   case RC_PID_EVENT_TYPE_PF_SAMPLE:
+      p += snprintf(pb + p, length - p,
+               "pf_sample %d %d %d %d",
+               ev->data.pf_sample, ev->data.prop_err,
+               ev->data.int_err, ev->data.der_err);
+      break;
+   }
+   p += snprintf(pb + p, length - p, "\n");
+
+   spin_unlock_irqrestore(&events->lock, status);
+
+   if (copy_to_user(buf, pb, p))
+      return -EFAULT;
+
+   return p;
+}
+
+#undef RC_PID_PRINT_BUF_SIZE
+
+static struct file_operations rc_pid_fop_events = {
+   .owner = THIS_MODULE,
+   .read = rate_control_pid_events_read,
+   .poll = rate_control_pid_events_poll,
+   .open = rate_control_pid_events_open,
+   .release = rate_control_pid_events_release,
+};
+
+void rate_control_pid_add_sta_debugfs(void *priv, void *priv_sta,
+                    struct dentry *dir)
+{
+   struct rc_pid_sta_info *spinfo = priv_sta;
+
+   spinfo->events_entry = debugfs_create_file("rc_pid_events", S_IRUGO,
+                     dir, spinfo,
+                     &rc_pid_fop_events);
+}
+
+void rate_control_pid_remove_sta_debugfs(void *priv, void *priv_sta)
+{
+   struct rc_pid_sta_info *spinfo = priv_sta;
+
+   debugfs_remove(spinfo->events_entry);
+}